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71.
F. M. Zhuravlev V. P. Lyalyuk A. K. Tarakanov E. V. Chuprinov D. A. Kassim 《Steel in Translation》2016,46(6):419-427
The metallurgical properties of roasted unfluxed pellets are studied as a function of the maximum roasting temperature, the proportions of silica introduced by silicates and quartz, and the quantity and composition of glassy silicate binder in the pellets. The mineral formation in the thermal strengthening of unfluxed pellets produced from concentrates with different mineral composition is analyzed. The microstructure of the final pellets is described. 相似文献
72.
In this paper a new Boolean equation for the orthogonalization of Boolean functions respectively of Ternary-Vector-Lists of disjunctive normal form is presented. It provides the mathematical solution of orthogonalization for the first time. The new equation is based on the new method of orthogonalizing difference-building ?. In contrast to other methods the new method has a faster computation time. Another advantage is the smaller number of product terms respectively of Ternary-Vectors in the orthogonalized result in contrast to other methods. Furthermore, the new equation can be used as a part in the calculation procedure of getting suitable test patterns for combinatorial circuits for verifying feasible logical faults. 相似文献
73.
The cold strength M
25(40) and M
10 of the coke determines the gas permeability of the batch bed in the blast furnace down to the viscoplastic zone of the ore
and the coke windows in that zone. The hot characteristics CRI and CSR determine the mechanical strength of the coke in the lower part of the furnace batch, in and below the viscoplastic zone,
including the furnace well. It is wrong to regard the hot and cold characteristics as alternatives, since they describe different
conditions; the significance of each one should be acknowledged. The coke consumption may be reduced with increase in reactivity
of the coke, so long as the high initial strength of the coke is maintained. The minimum permissible reactivity of the coke
without clogging of the hearth depends on the operating conditions in the specific blast furnace. 相似文献
74.
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76.
Arniza Ghazali Zulkarnain Zainal Mohd Zobir Hussein Anuar Kassim 《Solar Energy Materials & Solar Cells》1998,55(3):1053
Cathodic electrodeposition in the presence of EDTA in aqueous solution was found to offer some noteworthy improvements in our attempt to synthesise an SnS thin film. EDTA has shown its capacity for improving the longevity of the deposition bath as well as the adhesion of the deposited film on a titanium substrate. Photoelectrochemical analysis reveals outstanding photoactivity of the electrodeposited thin film, while an optical study shows an energy gap of approximately 1.1 eV. The effects of chelating agent were extracted from the results of cyclic voltammetry, photoelectrochemical test, scanning electron microscopy and X-ray diffraction spectroscopy. The latter which displays better defined signals reaffirms the appreciable improvement in the polycrystallinity of the thin film. Analysis of peak locations, coincidentally, confirms that SnS of Herzenbergite form has been obtained. 相似文献
77.
Tengku Shafazila Tengku Saharuddin Alinda Samsuri Fairous Salleh Rizafizah Othaman Mohammad Bin Kassim Mohamed Wahab Mohamed Hisham Mohd Ambar Yarmo 《International Journal of Hydrogen Energy》2017,42(14):9077-9086
Chemical reduction behaviour of 3% chromium doped (Cr–Fe2O3) and undoped iron oxides (Fe2O3) were investigated by using temperature programmed reduction (TPR). The reduced phases were characterized by X-ray diffraction spectroscopy (XRD). The reduction processes were achieved with 10% H2 in nitrogen (%, v/v), 10% and 20% of carbon monoxide (CO) in nitrogen (%, v/v). In hydrogen atmosphere, the TPR results indicate that the reduction of Cr–Fe2O3 and Fe2O3 proceed in three steps (Fe2O3 → Fe3O4 → FeO → Fe) with Fe3O4 and FeO as intermediate states. A complete reduction to metallic iron for both samples occurred at 900 °C. As for CO reductant, the profiles show the reduction of Fe2O3 also proceeded in three steps with a complete reduction occurs at 900 °C in 10% CO with no sign of carbide formation. Nevertheless, a 20% CO was able to reduce the completely at lower temperature at 700 °C and there is a formation of iron carbide at 500 °C but the carbide disappeared as the reduction temperature increase. Meanwhile in 10% CO atmosphere, Cr–Fe2O3 shows a better reducibility compared to Fe2O3 with a complete reduction at 700 °C, which is 200 °C lower than Fe2O3. A Cr dopant in the Fe2O3 can lead to formation of various forms of iron carbides such as F2C, Fe5C2, Fe23C6 and Fe3C as the CO concentration was increased to 20%. The transformation profile of iron phases during carburization follows the following forms, Fe2O3 → Fe3O4 → iron carbides (FexC). The XRD pattern shows the diffraction peaks of Cr–Fe2O3 are more intense with improved crystallinity for the characteristic peaks of Fe2O3 compare to undoped Fe2O3. No visible sign of chromium particles peaks in the XRD spectrum that indicates the Cr particles loaded onto the iron oxide are well dispersed. The uniform dispersion with no sign of sintering effects of the Cr dopant on the Fe2O3 was confirmed by FESEM. The study shows that Cr dopant gives a better reducibility of iron oxide but promotes the formation of carbides in an excess CO concentration. 相似文献
78.
79.
80.
Zakaria M.F. Kassim Z.A. Ooi M.P.-L. Demidenko S. 《Design & Test of Computers, IEEE》2006,23(2):88-98
To guarantee an industry standard of reliability in ICs, manufacturers incorporate special testing techniques into the circuit manufacturing process. For most electronic devices, the specific reliability required is quite high, often producing a lifespan of several years. Testing such devices for reliability under normal operating conditions would require a very long period of time to gather the data necessary for modeling the device's failure characteristics. Under this scenario, a device might become obsolete by the time the manufacturer could guarantee its reliability. High-voltage stress testing (HVST) is common in IC manufacturing, but publications comparing it with other test and burn-in methods are scarce. This article shows that the use of HVST can dramatically reduce the amount of required burn-in. 相似文献